1) Yeah, I think I kept non-center hitbox because I wanted to visit the idea of bullets not aiming straight at your hitbox, but ultimately forgot about the idea because skaltmoment and because I put the sprite center at necklace's crystal for my own programming comfort and never revisited the idea again. Hopefully I won't forget this time :peko:
2) I'll do a toggle between faster and slower focused movement on title screen or (not implemented) service mode, I didn't do an intermediate value (aka non-integer straight movement) because I explicitly work in 320x240 resolution with some entities rounding up from floating point to integer, so I wanted integer for smoother movement. (Edit: are you okay eith non-integer *visual* movement even if it won't look smooth?)